Really good suggestion, The images are awesome, and most sandbox games have a slider.
Zombie apocalypse, here I come. Oh, and when mojang finally adds full modding support you could generate your own structures and mobs. Full support.
I had previously posted about making cave/ravine/mineshaft generation adjustable, but another thing that could be added is to enable changing the average ground level from the default 64, as I did in this mod I made which doubles it to 128. Otherwise, I made no changes to terrain, as you can see here, switching to unmodded 1.6.4 to generate new chunks, 64 lower down but otherwise the same (oddly, partially generated mineshafts fully generate normally in new chunks, perhaps why structure data is saved).
Note that this requires a lot of things to be adjusted*, but you could just use a global value for the ground level and add it to height ranges, calculations of frequency, etc (for example, to keep iron ore generating to sea level, I doubled the range and doubled the veins generated, keeping the same density; 20 veins over 64 blocks vs 40 over 128 blocks (e.g. # of iron veins = average ground level * 0.3125, rounded to an integer); in another case, to ensure that slimes spawn normally in swamps, I had to add 64 to their range, but doubled the slime chunk range from under 40 to under 80 instead).
The class WorldProvider already provides an easy way to do this, simply change that one value/make it a variable (4 is for Superflat) and add in the call as needed elsewhere (currently, I've only hard-coded changes in):
public int getAverageGroundLevel()
return this.terrainType == WorldType.FLAT ? 4 : 64;
*Here is a list of classes I modified; note that the changes to Chunk and ChunkProviderGenerate in particular may cause problems with other mods that change world generation (1.6.x and earlier only use 128 blocks for terrain but I changed it to 256 like 1.7+; Chunk was also modified so it uses the original code when handling 128 high terrain so the Nether and End generate normally, although a 256 high Nether would be interesting, but would require changes to the terrain itself):
We really need more options in the game. We need this along with cubic chunks. A duo of those things would make minecraft much better. We would not only have more options. but a truly infinite world to do it with.
Would it be possible to have a world with oceans that are big enough to make the world not just one huge Pangaea continent?
Certainly; there is even a 1.7.2 mod that does just that, enabling you to have anything from a huge ocean with small islands to a single huge continent, in addition to changing the distribution of biomes and temperature zones (the last partially based on a mod I made that eliminated climate zones, though not configurable and making all biomes have a similar frequency).
There should be an option to also change the rules on which biomes spawn next to each other with more granularity. Most 1.7+ worlds are now the same biomes repeated for several minecraft days worth of travel in all directions. I want the new biomes but able to spawn a little closer together than they do. I would add sliders for things like biome size as well. Maybe you want to play with slightly larger biomes but not Large Biomes option? Maybe you want small biomes instead? I support this but would support it more with what I added also.
Rollback Post to RevisionRollBack
To those of you suggesting new uses for Emeralds in the suggestions forum: Emeralds have enough uses. You can trade with villagers to get diamond armor/tools/weapons and enchants. Stop suggesting that Emeralds are useless, and learn to play Minecraft. Thanks.